Method and apparatus for error processing in optical disk memories

In a device adapted for the retrieval and processing of data stored on an optical disk in a DVD format, the retrieval and processing of data including inner and outer code error correction for a Reed-Solomon product like code and an error detection process for evaluating an extent of errors in a sector of data, the sector of data encoded within a plurality of inner codes and parts of plural sectors encoded within each outer code, a method of correcting and detecting errors in the data, the method comprising:

• calculating an initial error detection value for data within the sector;
• performing an error correction operation on the data within the sector and determining an updated, intermediate error detection value responsive to the error correction operation;
• using a target error detection value and one of the initial error detection value and the intermediate error detection value to determine that the sector does not include errors;
• processing an outer code to provide a set of error patterns and error locations;
• and
• determining if any of the error locations are for data within the sector and not correcting data corresponding to the error locations within the sector.

In a device adapted for the retrieval and processing of data stored on an optical disk in a DVD format, the retrieval and processing of data including inner and outer code error correction for a Reed-Solomon product like code and an error detection process for evaluating an extent of errors in a sector of data, the sector of data encoded within a plurality of inner codes and parts of plural sectors encoded within each outer code, a method of correcting and detecting errors in the data, the method comprising:

• generating a target error detection value according scrambling rule;
• passing the sector and the target error detection value through an error processing circuit to determine whether or not one or more error correction operations are to be performed on data wholly or partially within the sector, the determining performed on a sector by sector basis;
• and
• subsequently descrambling the data within the sector and outputting the data within the sector.

In a device adapted for the retrieval and processing of data stored on an optical disk in a DVD format, the retrieval and processing of data including inner and outer code error correction for a Reed-Solomon product like code and an error detection process for evaluating an extent of errors in a sector of data, the sector of data encoded within a plurality of inner codes and parts of plural sectors encoded within each outer code, a method of correcting and detecting errors in the data, the method comprising:

• passing the sector and a target error detection value through a first error processing circuit to determine whether the sector is good or not;
• error correcting for the sector;
• passing the corrected data, the first error processing circuit output and a target error detection value through a second error processing circuit to determine whether the corrected sector is good or not;
• and
• subsequently descrambling the corrected data and outputting the corrected good data sector.

In a device adapted for the retrieval and processing of data stored on an optical disk in a DVD format, the retrieval and processing of data including inner and outer code error correction for a Reed-Solomon product like code and an error detection process for evaluating an extent of errors in a sector of data, the sector of data encoded within a plurality of inner codes and parts of plural sectors encoded within each outer code, a method of correcting and detecting errors in the data, the method comprising:

• passing the sector and a target error detection value through a error processing circuit to determine whether the sector is good or not;
• error correcting for the sector;
• passing the corrected data and a target error detection value through the error processing circuit to determine whether the corrected sector is good or not;
• and
• subsequently descrambling the corrected data and outputting the corrected good data sector.